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I'm seeing a return of an old problem with the TR-38-D size3 stack decoupler that first appeared way back in 0.23.5. The old problem was that if you staged this decoupler while your ship had an orbital velocity of less than about 800m/s (and the parts on either side of the decoupler had enough mass), the dropped stage became physics-less. Which meant it essentially stopped in place. If the ship is pointing in any direction other than perfectly prograde, the upper stage would slam into the stage just dropped at orbital velocity, causing ruin. Back in those ancient days, parts had a "PhysicsSignificance" line in their cfg files. If this was 0, physics applied. If this was 1, then the part was physics-less. The TR-38-D originally had this set to 1, which is what was causing the disasters. So we had to change that to 0, which solved the problem. These days, supposedly there are no physics-less parts, and the "PhysicsSignificance" line has been removed from part cfgs. HOWEVER..... I'm getting this exact same problem again today in 1.3.1. In a clean stock installation (except it has HyperEdit to speed things up), if I stage the TR-38-D in a 100km Munar orbit (velocity 466m/s < 800m/s), the lower stage stops in place and the upper stage slams into it. And there's no easy fix because there's no longer a PhysicsSignificance value to change. I asked about this over in the Gameplay Questions topic: I also posted the test ship I was using, which always has this problem: https://www.dropbox.com/s/q2zssq8ap50rmai/Test Krakensbane.craft?dl=0 And here's the save folder from my stock test game. This contains both the ship above AND https://www.dropbox.com/sh/kq9t8vf3y8nk5v0/AABeT2D7fqMBPdw12pzfSwJla?dl=0 Some folks have tried to replicate my problem without success. This leads me to believe that something got hosed up on my end in the game. Perhaps some game-level setting? I've looked for such a thing but nothing stood out. Any suggestions? Thanks.

KSP: Steam 1.0.5.1028 Mac OS X Problem: Game crashes when activating the TR-38-D decoupler Reproduction steps: Build a payload Add a mid-stage with Rhino engine Add a TR-38-D Add a 1st stage launcher, e.g. S3-7200 Tank and 5 S3 KS-25 engines. As soon as the stage with the TR-38-D is activated, the game crashes. I tried moving the decoupler to a different stage, it crashes anyway. Log: https://dl.dropboxusercontent.com/u/2610059/Player.log Video: The decoupler works with a simpler rocket. And I have changed the first stage to something simple and still fails.